Refinement of initial conditions for cosmological $N$-body simulations. (arXiv:1901.09210v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Tatekawa_T/0/1/0/all/0/1">Takayuki Tatekawa</a>
In modern cosmology, the precision of the theoretical prediction is
increasingly required. In cosmological $N$-body simulations, the effect of
higher-order Lagrangian perturbation on the initial conditions appears in terms
of statistical quantities of matter density field. We have considered the
effect of third-order Lagrangian perturbation (3LPT) on the initial conditions,
which can be applied to Gadget-2 code. Then, as statistical quantities,
non-Gaussianity of matter density field has been compared between cases of
different order perturbations for the initial conditions. Then, we conclude
that we should apply the initial conditions with 3LPT for predictions of
precision cosmology,
In modern cosmology, the precision of the theoretical prediction is
increasingly required. In cosmological $N$-body simulations, the effect of
higher-order Lagrangian perturbation on the initial conditions appears in terms
of statistical quantities of matter density field. We have considered the
effect of third-order Lagrangian perturbation (3LPT) on the initial conditions,
which can be applied to Gadget-2 code. Then, as statistical quantities,
non-Gaussianity of matter density field has been compared between cases of
different order perturbations for the initial conditions. Then, we conclude
that we should apply the initial conditions with 3LPT for predictions of
precision cosmology,
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